AP Biology Final Exam Review with Complete Solutions

AP Biology Final Exam Review with Complete Solutions acquired immunity immunity that the body develops after it overcomes a disease, or through inoculation (such as vaccination) acrosomal reaction the discharge of hydrolytic enzymes from the acrosome, when the sperm contacts an egg action potential a neural impulse; a brief electrical charge that travels down an axon; the action potential is generated by the movement of positively charged atoms in and out of channels in the axon's membrane adaptations the behaviors and physical characteristics that allow organisms to live successfully in their environments adenosine triphosphate the molecule that stores energy that can be used by the cell adhesion an attraction between molecules of different substances alleles different forms of a gene allopatric speciation the formation of new species in populations that are geographically isolated from one another altruism unselfish regard for the welfare of others amniotes their embryos are protected by external membranes amoeba A type of protist characterized by great flexibility and the presence of pseudopodia amygdale brain region that regulates emotions angiosperm a flowering plant, which forms seeds inside a protective chamber called an ovary antidiuretic hormone hormone secreted by the posterior pituitary gland to prevent the kidneys from expelling too much water antigen substance that triggers an immune response apical meristems embryonic plant tissue in the tips of roots and in the buds of shoots that supplies cells for the plant to grow in length